Acetylation of Eugenol on Functionalized Mesoporous Aluminosilicates Synthesized from Amazonian Flint Kaolin

Abstract

The present work was aimed to investigate the catalytic activity of a mesoporous catalyst synthesized from 3-mercaptopropyltrimethoxysilane (MPTS) functionalized Amazonian flint kaolin in the acetylation of eugenol with acetic anhydride. Materials were characterized by thermogravimetry (TGA), N2 adsorption (BET), X-ray dispersive energy spectroscopy (EDX), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and acid-base titration. The results presented proved the efficiency of flint kaolin as an alternative source in the preparation of mesoporous materials, since the material exhibited textural properties (specific surface area of 1071 m2 g−1, pore volume of 1.05 cm3 g−1 and pore diameter of 3.85 nm) and structural properties (d100 = 4.35 nm, a0 = 5.06 nm and Wt = 1.21 nm) within the required and characteristic material standards. The catalyst with the total amount of acidic sites of 4.89 mmol H+ g−1 was efficient in converting 99.9% of eugenol (eugenol to acetic anhydride molar ratio of 1:5, 2% catalyst, temperature and reaction time 80 °C and 40 min reaction). In addition, the reused catalyst could be successfully recycled with 92% conversion activity under identical reaction conditions.

Valorization of Deodorizing Distillate Palm Oil Residue for Larvicidal Activity Against Aedes aegypti and Synergistic Effect of Their Free Fatty Acids

“…Mosquitoes are the protagonists of several diseases that cause a strong impact on human health. This fact is evidenced mainly in tropical and subtropical regions of the world [13][14][15]. The Aedes aegypti mosquito is a global vector of human diseases, involving the transmission of pathogens responsible for causing diseases in humans, such as yellow fever, dengue, Zika, and Chikungunya fever [16,17].…”

Advances in the Catalytic Conversion of Biomass Components to Ester Derivatives: Challenges and Opportunities

“…In the first work of this Special Issue, de Oliveira et al [2] have investigated the acetylation of eugenol with acetic anhydride, deepening the catalytic activity of a mesoporous catalyst, synthesized from 3-mercaptopropyltrimethoxysilane functionalized Amazonian flint kaolin, a kaolinitic waste residue disposed in the mine shortly after exploration. This work is well-supported by the value of the final product, eugenyl acetate, which can be used as a natural and efficient larvicide.…”